Wallboard is one use of the mineral gypsum due to its inherent fire resistance.
What is gypsum?
A widely distributed mineral consisting of hydrous calcium sulfate that is used especially as a soil amendment and in making plaster of paris.
Gypsum drywall is what most modern walls are built with.
The boards are made of dried gypsum plaster sandwiched between two sheets of heavy paper creating a board that is easier to install than traditional plaster applied with a trowel.
Hence, option C is correct.
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